说明
The TMS320VC549 fixed-point, digital signal processor (DSP) (hereafter referred to as the '549) is based on an advanced modified Harvard architecture that has one program memory bus and three data memory buses. The processor also provides an arithmetic logic unit (ALU) that has a high degree of parallelism, application-specific hardware logic, on-chip memory, and additional on-chip peripherals. The '549 also utilizes a highly specialized instruction set, which is the basis of its operational flexibility and speed.
Separate program and data spaces allow simultaneous access to program instructions and data, providing the high degree of parallelism. Two reads and one write operation can be performed in a single cycle.
特性
- Advanced Multibus Architecture With Three Separate 16-Bit Data Memory Buses and One Program Memory Bus
- 40-Bit Arithmetic Logic Unit (ALU) Including a 40-Bit Barrel Shifter and Two Independent 40-Bit Accumulators
- 17-× 17-Bit Parallel Multiplier Coupled to a 40-Bit Dedicated Adder for Non-Pipelined Single-Cycle Multiply/Accumulate (MAC) Operation
- Compare, Select, and Store Unit (CSSU) for the Add/Compare Selection of the Viterbi Operator
- Exponent Encoder to Compute an Exponent Value of a 40-Bit Accumulator Value in a Single Cycle
- Two Address Generators With Eight Auxiliary Registers and Two Auxiliary Register Arithmetic Units (ARAUs)
- Data Bus With a Bus Holder Feature
- Address Bus With a Bus Holder Feature
- Extended Addressing Mode for 8M × 16-Bit Maximum Addressable External Program Space
- 192K× 16-Bit Maximum Addressable Memory Space (64K Words Program,
64K Words Data, and 64K Words I/O)
- On-Chip ROM with Some Configurable to Program/Data Memory
- Dual-Access On-Chip RAM
- Single-Access On-Chip RAM
- Single-Instruction Repeat and Block-Repeat Operations for Program Code
- Block-Memory-Move Instructions for Better Program and Data Management
- Instructions With a 32-Bit Long Word Operand
- Instructions With Two- or Three-Operand Reads
- Arithmetic Instructions With Parallel Store and Parallel Load
- Conditional Store Instructions
- Fast Return From Interrupt
